A study of the surface hardening process of the 42CrMo4 steel alloy by means of an oscillating laser beam has been carried out. For this purpose, a fiber coupled high power diode laser source and a galvanometric mirror scanner have been used. The study is focused on determining the influence of the oscillation frequency parameter on the temperature, geometry, microstructure, microhardness and stress state of the treated region, as well as its relationship with the key parameters of the laser hardening process. The results confirm that the surface hardening process of the 42CrMo4 alloy by means of an oscillating laser beam is an alternative technique to the conventional laser surface hardening methods based on fixed optical guidance systems. On the other hand, the selected frequency of oscillation has a significant influence on the treated region, mainly on the temperature, and, consequently, on the geometry, microstructure and stress state of the same. The selection of a high oscillation frequency, able to maintain the material temperature above that of austenization and below that of melting, is decisive to ensure the stability and uniformity of the treatment.

已经研究了通过振荡激光束对42CrMo4钢合金的表面硬化过程的研究。为此，已经使用了光纤耦合的高功率二极管激光源和电流镜反射器。这项研究的重点是确定振荡频率参数对处理区域的温度，几何形状，显微组织，显微硬度和应力状态的影响，以及其与激光淬火过程关键参数的关系。结果证实，通过振荡激光束对42CrMo4合金进行表面硬化处理是基于固定光导系统的常规激光表面硬化方法的替代技术。另一方面，选择的振荡频率会对治疗区域产生重大影响，主要取决于温度，因此也取决于几何形状，微观结构和应力状态。选择高的振荡频率，能够保持材料温度高于奥氏体化温度并低于熔化温度，对于确保处理的稳定性和均匀性至关重要。